St. John & Partners has named Jim Mitchell managing director of the Jacksonville, Fla., agency's Clearwire account. A 25-year ad industry veteran, Mitchell (left) previously was an independent brand consultant in Atlanta. Elizabeth Kempf, Aaron Peacock and Eric Stull have arrived as studio artists. Kempf most recently was a graphic designer for BizAtomic. Peacock joins SJ&P after freelancing with the shop. Stull was a graphic artist for Community Newspapers in Miami. Alyssa Weinberg has been hired as a media planner on the Clearwire account. Weinberg previously held the same title at GSD&M in Austin, Texas.